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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60964ec27319d513de632a4a3ac95ec6b783232653a1ed73b80fd4c8f0e77731' 
  AND token = 'eltQ4aKxmSWkUfmNW0+iTOSFydOMy6js7S9Yim2i0P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}